The time evolution of a blast wave resulting from an intense explosion is a classic problem in gas dynamics [1]}, [2]}, [3]}. After an initial transient period when energy is transported in the form of radiation, the system enters a hydrodynamic regime where radiation becomes less important, and the transport of energy is dominated by transfer of matter. The disturbance grows radially outwards and a shock front forms the boundary between the perturbed gas and the ambient gas. Across the shock front, thermodynamic quantities like density, velocity, temperature, and pressure are known to be discontinuous [1]}, [3]}.
